Question: bumps that are hard under the skin?
Answer: Epidermoid cyst. An epidermoid cysts are small, round lumps under your skin. ... 
Lipoma. ... 
Dermatofibroma. ... 
Keratoacanthoma. ... 
Skin abscess. ... 
Swollen lymph node. ... 
Hernia. ... 
Ganglion cyst.