Why does extra skin grow under my nails?
Sarah Oconnell
Published Apr 20, 2026
Pterygium inversum unguis (PIU) occurs when the
hyponychium
The hyponychium is the area of epithelium, particularly the thickened portion, underlying the free edge of the nail plate on the nail. Its proximal border is immediately distal to distal limit of nail bed—a.k.a. the onychodermal band (the line along the interface of the nail bed and the nail plate).
wikipedia.org › wiki › Hyponychium
Why is the skin under my nails so long?
"There are three main reasons. The most common reason is because the hyponychium attaches to the underside of the nail as it grows. For some, it seems to be genetic, while for others, it may be caused by wearing your nails long with gel or acrylic nails for too long, contact dermatitis, or some sort of nail injury.How do you fix hyponychium?
How to Treat the Hyponychium. "If it's due to an overgrowth caused by long nails, take a break from time to time and maintain short nails. Use cuticle oil or a cuticle remover to soften the thickened skin. If it's caused by nail psoriasis or fungal infections, see your dermatologist for a topical treatment."What is the difference between hyponychium and Eponychium?
The hyponychium is a strong seal at the end of the finger and under the free edge. The eponychium is an area under the proximal nail fold that sheds the dead skin cells of the proximal nail fold called the cuticle. The cuticle and proximal nail fold form another strong and important seal of the nail unit.How do you get rid of extra skin under your nails?
How to treat it
- Avoiding certain manicures. If gel manicures or acrylic nails are causing PIU, avoiding these procedures will usually reverse it. ...
- Corticosteroids. A doctor can prescribe a topical corticosteroid if you have nail psoriasis. ...
- Antifungal medication. ...
- Cuticle oil.