L66: Cicatricial alopecia [scarring hair loss]
L66.3: Perifolliculitis capitis abscedens
Your hair roots are inflamed because a lot of sebum has been excreted by the surrounding sebaceous glands. When hair roots are persistently inflamed, they become damaged. New hair can no longer grow there. Only small areas are affected by the hair loss.
Pus-filled cysts often form on the scalp, in the armpits, or in the groins. The cysts may also seclude and press into the tissue. Tiny tunnels below the skin are typical of the condition. If you press on those areas, pus or a watery, bloody fluid usually leaks out. Deep scars are often left behind.
The cause of this disorder is unknown. Certain bacteria probably play a part.
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If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.
For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.