Onychogryphosis also called ram's horn nail is a disease involving nail and is characterized by hypertrophic enlargement of the nail into a horn or claw shaped structure. The nail typically appears yellowish-brown, curved and usually involves the toe nail. This condition is commonly associated with skin disorders like psoriasis, poor peripheral circulation, trauma to nail, old age and poor personal hygiene. Picture credit: https://www.healthline.com/health/onychogryphosis