Lesions

PRIMARY LESIONS:

• 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:

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.