It is a self-limited, asymptomatic, trauma-induced darkening of the back of the heel that occurs primarily in young adult athletes.
Although clinically insignificant, black heel is important because of its close clinical resemblance to melanoma.
It is a disease affecting the joints causing inflammation, swelling and development of hard tophi on the joints, especially those of the fingers and toes.
It is caused by disorder of the purine metabolism leading to build up of uric acid in the blood and deposition of monosodium urate monohydrate crystals in the joints. Serum uric acid levels are elevated.
Warts are benign proliferations of skin and mucosa caused by human papilloma virus (HPV) having various shapes and appear on typical sites on the body.
They are usually painless.
It is a benign adnexal neoplasm composed of epithelial cells showing tubular differentiation.
They are usually present as a solitary papule or nodule that is mostly asymptomatic, but rarely painful.