Alopecia areata is usually diagnosed based on clinical features. Trichoscopy may aid in establishing the diagnosis. In alopecia areata, trichoscopy shows regularly distributed "yellow dots" (hyperkeratotic plugs), small exclamation-mark hairs, and "black dots" (destroyed hairs in the hair follicle opening). Oftentimes, however, discrete areas of hair<unk>  surrounded by exclamation mark hairs is sufficient for clinical diagnosis of alopecia areata. Sometimes, reddening of the skin, erythema, may also be present in the balding area. A biopsy is rarely needed to make the diagnosis or aid in the management of alopecia areata. Histologic findings may include peribulbar lymphocytic infiltration resembling a "swarm of bees", a shift in the anagen-to-telogen ratio towards telogen, and dilated follicular infundibulae. Other helpful findings can include pigment incontinence in the hair bulb and follicular stelae. Occasionally, in inactive alopecia areata, no inflammatory infiltrates are found. Classification Commonly, alopecia areata involves hair<unk>  in one or more round spots on the scalp. * Hair may also be lost more diffusely over the whole scalp, in which case the condition is called diffuse alopecia areata. * Alopecia areata monolocularis describes baldness in only one spot. It may occur anywhere on the head. * Alopecia areata multilocularis refers to multiple areas of hair<unk> . * Ophiasis refers to hair<unk>  in the shape of a wave at the circumference of the head. * The disease may be limited only to the beard, in which case it is called alopecia areata barbae. * If the person loses all the hair on the scalp, the disease is then called alopecia areata totalis. * If all body hair, including pubic hair, is lost, the diagnosis then becomes alopecia areata universalis. Alopecia areata totalis and universalis are rare.
types of Hair loss
symptom of Osteomyelitis
symptom of Osteoporosis
symptom of Cartilage–hair hypoplasia
symptom of Bone tumor
symptom of Skin cancer
symptom of Osteoarthritis
symptom of Keratoconus