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  • Macule – Small discolored spot or patch neither raised nor sunken on the skin.
  • Papule – small elevated pimple without fluid or sometimes develop pus.
  • Wheal – Itchy, swollen spot due to mosquito or insect bites.
  • Tubercle – Soiled lump projective above or under the surface of the skin.
  • Tumor – External swelling varying in size, shape and color.
  • Vesicle – Small blister with clear fluid in it, beneath the epidermis.
  • Bulla – Large blister containing watery fluid.
  • Pustule – Pimply looking elevation with inflamed base containing pus.


Secondary lesions develop in the later stage of the disease which includes:

  • Scale – Dry or greasy epidermal flakes.
  • Crust or Scab – Accumulation of sebum and pus with epidermal material.
  • Excoriation – Skin abrasion produced by scratching or scraping due to loss of the skin.
  • Fissure – Crack in the skin penetrating into the dermis.
  • Ulcer – Mucous membrane of the body accompanied by pus.
  • Scar – Usually forms after healing an injury or skin condition.
  • Stain – Abnormal discoloration of skin.
  • Acute – A less violent skin disease.
  • Chronic – A long duration and recurring disease.
  • Infectious – A disease caused by pathogenic germs.
  • Contagious – A disease communicable by contact.
  • Seasonal – Influenced by the weather.
  • Occupational – Afflicted by one’s occupation.
  • Parasitic – Caused by a vegetable or animal parasitic.
  • Pathogenic – A disease produced by bacteria.
  • Systemic – Over functioning of internal glands.
  • Venereal – A disease acquired by contact with an infected person usually during sexual intercourse.
  • Epidemic – A disease that attacks simultaneously large number of persons.
  • Allergy – Caused by contact with foods, cosmetics, medicines and tints resulting in itching, redness, swelling, blisters, oozing, pain, heat and scaling.

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