Alopecia areata: Causes, diagnosis and treatments

Alopecia areata is a condition that causes hair loss in small, round patches. The exact cause of alopecia areata is not well understood, but it is believed to be an autoimmune disorder in which the immune system mistakenly attacks hair follicles. Here is an overview of the causes, diagnosis, and treatments for alopecia areata: Causes: Autoimmune Response: The leading theory is that alopecia areata is an autoimmune disorder. The immune system mistakenly identifies hair follicles as foreign invaders and attacks them, leading to hair loss. Genetics: There is evidence suggesting a genetic predisposition to alopecia areata. Individuals with a family history of autoimmune diseases or alopecia areata may be at a higher risk. Environmental Factors: Some environmental factors, such as viral or bacterial infections, may trigger the onset of alopecia areata in individuals with a genetic predisposition. Diagnosis: Clinical Examination: A healthcare professional, typically a dermatologist, will examine the affected areas of the scalp and may also look at the nails, as abnormalities in the nails can be associated with alopecia areata. Biopsy: In some cases, a skin biopsy may be performed to confirm the diagnosis. This involves taking a small sample of skin from the affected area and examining it under a microscope. Blood Tests: Blood tests may be conducted to rule out other autoimmune conditions or deficiencies that could contribute to hair loss. Treatments: Topical Corticosteroids: Corticosteroid creams or ointments applied directly to the affected areas can help suppress the immune response and reduce inflammation. Intralesional Corticosteroid Injections: Injections of corticosteroids directly into the affected areas of the scalp can be effective, especially for larger patches of hair loss. Topical Minoxidil: Minoxidil, a medication commonly used to promote hair growth, may be applied topically to stimulate hair follicles. Immunotherapy: This involves using substances like diphencyprone or squaric acid dibutyl ester to induce an allergic reaction on the scalp. This reaction may alter the immune response and encourage hair regrowth. Oral Corticosteroids: In severe cases, oral corticosteroids may be prescribed to suppress the immune response. However, these medications have potential side effects and are usually reserved for more extensive cases. JAK Inhibitors: Janus kinase (JAK) inhibitors, such as tofacitinib and ruxolitinib, are medications that can modulate the immune response and have shown promise in the treatment of alopecia areata.