Hyperkeratosis is a condition where thickening of the outer skin layer occurs on the skin. It often occurs due to excessive pressure, inflammation, or skin irritation. There is no cure for this condition. Rubbing emollients in the skin can help to treat them.
Acanthosis Nigricans
This article discusses the causes and management of dirty non-cleanable darkness over the neck and underarms, known as acanthosis nigricans.

Flegel Disease - Causes, Clinical Features, Diagnosis, and Treatment
The Flegel disease is also described as hyperkeratosis lenticularis perstans or HLP, a rare skin disorder. Read below to get further information.