It could be. Related to stretching of skin due to fluid retention.
I have a rash on my upper arms, armpits, breasts, back and its the worst on my stomach and tighs. It looks like red bumps, but it hardly itches at al
Pityriasis rosea? This rash, which often follows a viral or upper respiratory infection, often begins with a single patch, classically on the abdomen or armpit. It then spreads to the extremities. Only about 1/4 people suffer from itching. No treatment is usually required, especially if there is no itching. UV light/sunlight may speed recovery. It usually resolve in a matter of weeks, but up to 6 months. Good luck. Read more...