Tiny but mighty: Guess who am I?

I am a tiny bit of skin looking not so great;

The inquisitive dermatologist no more can wait,

Gently drills a hole and squeezes me out;

To the lab swimming in a pool of formalin I’m got,

Wrapped in a filter paper, inside a cassette I rest;

As baths of xylene, acetone and alcohol for hours I get,

Armored by wax so white makes me overly hard;

As thin slices of me are cut I better be on guard!

And Lo! I’m delighted to see my make up in pink and blue;

Coz it is only now that I can give the pathologist some clue,

As he puts me under his microscope my fate to decide;

‘You’re a tough nut to crack’ saying he puts me aside,

But referring books and literature he will never cease;

Soon patterns and findings in me he interprets with ease,

Tumors, cysts, inflammations & infections within me one can see,

An endless list of lesions is what I can be!

Intricate, yet decisive at times;

Leaving the doctor confused sometimes,

Here to stay for many more years

I’m but a smidgen of punch biopsy my dears!