- 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.