numerous things: Arthritis, trauma, insect bites and several other causes. Have a doctor take a look if you are concerned.
Answered 10/24/2013
4.8k views
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
A doctor has provided 1 answer
5 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question