I am 59 female, good health, started bootcamp- type intensive fitness sessions a few months ago. about 4 weeks ago. Around that time, I noticed my left arm hurt and itched like crazy, very deep in my left upper underside of my arm. This area of my arm still hurts just to touch it, and a large area (softball size) now shows bruising. Can use arm, lift, work in the yard, etc, but nags me and hurts to touch. Thought I would just give it time, but husband and kids are worried.
Hello, Thanks for the concern. According to history it might be an allergic reaction, so you can use antihistamines Chat Doctor.  But according to you, it also hurts and had history of intensive fitness sessions so for pain you can take painkillers. Also, you have to take rest and if possible avoid use your arm. But consult the physician regarding it. Take care