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Residents’ Page
89 (
2
); 313-316
doi:
10.25259/IJDVL_580_2021
pmid:
35593292

Soaks and compresses in dermatology revisited

Dermatology, Venereology and Leprology, KMC Manipal, Manipal, Karnataka, India
Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India
Corresponding author: Dr. Geetali Kharghoria, Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India. geetalikharghoria@gmail.com
Licence
This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-Share Alike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.

How to cite this article: Kayarkatte MN, Kharghoria G. Soaks and compresses in dermatology revisited. Indian J Dermatol Venereol Leprol 2023;89:313-6.

Soaks have been one of the traditional methods of treatment as evidenced by the use of potassium permanganate soaks dating to the late 19th century to treat an infection. Current practice advocates the use of various types of soaks in clinical practice, and it poses a tricky question to answer for a beginner.

Condy’s soaks

History

The use of potassium permanganate dates back to the 1850s when Henry Bollman Condy advocated it as a surface disinfectant, water purifier and cleanser for infected wounds. It became popular as Condy’s fluid.1

Mechanism of action

  1. Astringent: it draws water out of the cells leading to drying of oozy lesions.

  2. It is an oxidising agent liberating nascent oxygen, responsible for its antibacterial and anti-fungal properties.2

  3. Anti-pruritic and anti-inflammatory properties.

Indications

  1. Weeping lesions of dermatitis atopic dermatitis, allergic contact dermatitis or irritant contact dermatitis.3

  2. Chronic leg ulcers—venous ulcers and diabetic ulcers.4

  3. Oozing lesions of bullous disorders like pemphigus foliaceus or vulgaris.

  4. Haemorrhagic crusts over the vermillion lip in Stevens-Johnson syndrome.

  5. Condy’s gargles may be used for the management of oral ulcers. However, extra dilutions are needed for mucosal surfaces to prevent irritation and paradoxical ulceration.

Available form

Crystals are available in India and some companies provide 400 mg sachets of crystals. In the United Kingdom, it is available in the form of 400 mg tablets for dissolution, and liquid.3

Storage

It is advisable to store it in a dry and airtight packet.

Preparation of soaks

The preparation used for medicinal purposes is diluted to 1:10,000 which is usually achieved by dissolving 400 mg of potassium permanganate in 4 L of water.5 However, in clinical practice an easy way to educate patients is to dilute the solution to reach a colour that matches the pink colour of ones nail bed [Figure 1]. Caution should be exercised that the bottom of container remains visible, i.e., the colour becomes hazy to semi-transparent due to dilution without any visible crystals. Some may even recommend a separate smaller container to dissolve the crystals, followed by pouring of stronger concentrate into the bucket/tub for soaking. This avoids crystals in the bucket as they settle in the smaller container. The contact time for soak solution should be <15 minutes as oxidation makes it ineffective.5 There is no need to rinse with water at the end of procedure.

Figure 1:
Freshly prepared therapeutic solution of Potassium Permanganate

The soak maybe applied by dipping the affected area in the solution in a bucket or bath depending on the size and site of involved area. Extra care is necessary for genitals. Another effective method is the application of gauze swabs or clean cotton soft cloth folded in several layers soaked in Condy’s solution on the affected areas, called Condy’s compresses (preferably dipping/soaking the gauge piece every 3–4 minutes for 10–15 minutes [Figure 2]. Yellowish-brown discoloration of the solution indicates its end of effectiveness.

Figure 2:
Condy’s compress being done for crusted erosions of pemphigus vulgaris

Side effects and their prevention

  1. It is corrosive and maycause burns; hence the extra precaution for dilutions and ensuring complete and uniform dissolution of the crystals [Figure 3]. Special care is needed to avoid its contact with mucosae.

  2. Temporary skin and nail discolouration are common. Nails can be covered with paraffin to prevent this. Fresh stains over the skin can be removed by rubbing a damp tablet of vitamin C over the affected areas.

  3. Patients should be warned about the staining of fabrics and ceramic vessels/bathtubs.

  4. This product must be kept out of reach of children as it is nephrotoxic and hepatotoxic if ingested.3,5

Figure 3:
Potassium permanganate crystals causing ulcers on the dorsum of left hand (Image courtesy: Reviewer 1)

Acetic acid soaks

Introduction

Acetic acid is a synthetic carboxylic acid with antibacterial and antifungal properties. The natural food sugars are fermented by yeast to form alcohol, which subsequently transforms into acetic acid by Acetobacte spr. Though used for thousands of years as a food preservative, its activity against Pseudomonas was first demonstrated during World War-I.

Pharmacology

Glacial acetic acid (99.9%) appears as a clear colourless liquid with pungent smell. Though corrosive, it is non-toxic at concentrations ≤5%, as used in vinegar.6 Acetic acid is liquid at ambient pressure and temperature, therefore, any preparation containing acetic acidis a liquid.

Mechanism of action

Undissociated acetic acid enhances lipid solubility, allowing accumulation of fatty acids on the cell membrane or other cell wall structures leading to the cellular death. Infected wounds have an average pH of 9; acetic acid being a weak acid lowers the pH thereby inhibiting bacterial carbohydrate metabolism, protease activity, and growth of microorganisms. It also improves tissue oxygenation and wound healing by decreasing tissue pH (Bohr effect).7

Acetic acid has good bacteriostatic activity against Pseudomonas aeruginosa, including multiple antibiotic-resistant strains. It also acts against other Gram-negative and Gram-positive bacteria, including Staphylococcus aureus (methicillin-susceptible and methicillin-resistant strains), and Acinetobacter baumannii.8 It kills planktonic bacteria and eradicates bacteria growing in mature biofilms.9,10

Advantages

  1. It has good antibacterial activity, not affected by organic materials such as cotton.6

  2. It prevents the development of drug-resistant strains of microorganisms in the hospital environment.

  3. It does not affect the re-epithelialization of wounds unlike other antiseptics such as 10% povidone with 1% free iodine, 0.25% sodium hypochlorite or 3% hydrogen peroxide.7

  4. It promotes wound healing in hypergranulating wounds.

  5. Relatively inexpensive.

Indications

Acetic acid is approved for bladder irrigation and treating otitis externa as 0.25% and 2% solution, respectively. Its use in dermatology is as follows:

  1. Infected wounds, especially when multi-drug resistant.

  2. Local wound care in patients with pemphigus vulgaris.11

  3. Chronic non-healing wounds, including hypergranulating wounds.

  4. Reduces staphylococcal colonization in eczema/ atopicdermatitis.12

  5. Vinegar sock soak for tinea pedis/onychomycosis.13

  6. Chloronychia.

Preparation of soaks

It is prepared by adding an appropriate amount of distilled water carefully into glacial acetic acid with adequate personal protection, to reach the target concentration of 1–5%. It is then stored in amber-coloured bottles, away from the light with an airtight seal. Evaporation has a negligible impact on its activity in first 24 hours.10 Sterile gauze soaked in diluted acetic acid is applied over the wound for 15 minutes twice daily for 1–2 weeks. It can also be used as an irrigating solution or foot soak in necrotic wounds, particularly if associated with Pseudomonas or anaerobic flora. Patients may be instructed to prepare appropriate vinegar/acetic acid solution at home, instead of buying more expensive medical-grade acetic acid.

Side-effects and their prevention

Mild stinging and burning sensations are commonly reported. Chemical burns are reported after prolonged contact at concentrations >5%.14 Thus, these solutions should not be used for a prolonged contact period for risk of cytotoxicity.11 Precautions should be taken to avoid eye contact.

Other soaks

Multiple other soaks are used in dermatology for wound care and skincare as listed in Table 1.12-20 Psoralen soak or bath followed by UVA irradiation called PUVA has multiple indications. It is essential for a resident to soak in this knowledge in detail from available guidelines.

Table 1: Commonly used soaks in dermatology and their preparation
Name of Soak Preparation Uses
Hydrogen peroxide soak Used as 2–3% solution of H2O2 (readily available or prepared by dilution with normal saline). Soak the area for 5 mins. Staph. aureus infected wounds. Deep wounds requiring debridement and orthopaedic interventions. Prior to skin graft for better graft uptake.
PUVA soaks Dilute 8-methoxypsoralen in water to 2.6–3.75 mg/L Bath for 15 mins and immediately irradiate to UVA or soak hands and feet for 15 mins, wait for 30 mins (for penetration) and irradiate. Psoriasis, palmoplantar pustulosis, atopic dermatitis, vitiligo, pityriasis rubra pilaris, mycosis fungoides, others.
Atopic dermatitis— soak and smear Soak in plain water for 20 mins followed by smearing of mid-strength to high-strength. Corticosteroid ointment. Atopic dermatitis.
Eczema Bath Bleach bath: Sodium hypochlorite 6% (½ cup in 1 bathtub) — soak for 5–10 mins. Epsom bath: Dead sea salt bath (magnesium-rich salt). Atopic dermatitis. Extensive contact dermatitis. Air-borne dermatitis.
EUSOL (Edinburgh University Solution of Lime) soak Mix 12.5 mg sodium hypochlorite, 12.5 mg boric acid in 1 L of water. Soak for 30 mins. Chronic non-healing ulcer.
Saline soak Swab soaked in normal saline is kept on the lesion for 10–15 mins. Warmed saline can be used for Sitz bath. Crusted lesions at sensitive area-periorbital, perioral, face, and genital, hidradenitis suppurativa, pyoderma gangrenosum.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent.

Conflicts of interest

There are no conflicts of interest.

Financial support and sponsorship

Nil.

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