I noticed a small red sore that looked like a scab on my right breast is this something to worry about?

Probably not.: If it goes away in a week or two and does not return, it is likely nothing. Any sore that does not heal or keeps coming back, though, needs to be checked out. Avoid fragrances and harsh soaps and detergents and all fabric softeners, which are hard on the skin, especially where clothing fits snugly. If you have signs of infection (redness, pus, pain,warmth or fever), get checked ASAP.