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Introduction to Dermatology

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Introduction to Dermatology

Prof. S.Anandan, MD, DD*


No two skin diseases look alike

Most skin diseases have characteristic primary and secondary lesions

Primary skin lesions may be obliterated by secondary lesions

Complete examination of entire body is a necessity when confronted with a diffuse skin eruption.

  • Points in history taking

Elicit nature and course of disease

Family history

Any other factors in disease exacerbation

Record the recent use of drugs

  • Points in examining the skin:

Examining the entire skin surface

Use hand lens and adequate illumination

Look at nails, mucous membranes and hairs

Observe for distribution, individual lesions


  • Lesion Description Example

  • Macule Circumscribed alteration of skin vitiligo colour <0.5cm size freckles

  • Patch More than 0.5 c.m.

  • Papule Circumscribed, solid elevated Lichen planus lesion of <0.5cm molluscum contagiosum

  • Nodule Larger than 0.5 cm with depth neuro fibroma/dematofibroma

  • Pustule Pus filled blister furuncle

  • Plaque Circumscribed elevated plateau psoriasis, lupus vulgaris like elevation of skin of more than 0.5 cm

  • Vesicle Fluid filled lesions of 0.5 cm size

* - Professor and HOD - Dermatology

Sri Ramachandra Medical College& Research Institute (Deemed University)


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