The main symptoms of skin conditions are bumps, rashes and other types of lesions, according to WebMD and the American Academy of Dermatology. These conditions may be accompanied by itching and discolorations.
With eczema, a person is afflicted with itching that is followed by a rash, says WebMD. The rash is most often found on the person's face, the back of the knees and the extremities. With fair-skinned people, the rash is dry and reddish and turns brown over time. In darker-skinned people, the hue of the affected skin can be lighter or darker than the skin around it. Experts do not know what causes eczema, but many believe it is the body's overreaction to an irritant.
With psoriasis, the skin cells grow so quickly they build up and form silvery plaques over the body, explains the American Academy of Dermatology. Psoriasis is an inherited autoimmune disease. There are several types of psoriasis. One kind, exfoliative psoriasis, is a medical emergency.
Skin cancer is the most common cancer, states the American Academy of Dermatology. The three major types are basal cell, squamous cell and melanoma. All of them are curable in their early stages, but melanoma is especially dangerous and can metastasize to other organs. Actinic keratoses are precancerous lesions.