Answer first
Alopecia areata is an autoimmune condition where the immune system targets hair follicles, causing smooth, round bald patches that can appear suddenly on the scalp, beard or eyebrows. It needs a doctor or dermatologist's diagnosis and treatment; scalp care and hair systems can support confidence alongside, but do not replace medical care.
Signs
Smooth, coin-sized patches; sometimes short broken hairs at the edge; nails can be pitted.
What doctors may do
Confirm the diagnosis and discuss treatments suited to the size and number of patches.
Living with it
Many patches regrow on their own; covering options like toppers, hair systems or brow help can ease daily life.
Questions
Is it contagious?
No.
Can stress trigger it?
Stress may be linked in some people, but the cause is mainly immune.