Could it be cancer? breasts have itched for 6 months, had a rash on left 3 weeks ago, raw/red nipples on both 12/25, now both armpits and breast hurt.

Not likely: What you described is not typical for a breast cancer, however, it is not feasible to provide a meaningful opinion without additional history, physical examination and may be mammogram. It would be prudent to see your doctor. See this site for information in this topic. http://www.mayoclinic.com/health/breast-cancer/ds00328.

Check it out: Any breast complaints like that should be looked at. Itching is a rare presentation for breast cancer, though. Simultaneous bilateral cancer is rare. Finally, breast cancer symptoms tend to get worse, rather than to come and go. So absolutely, show your doctor your problem. You could try some topical Benadryl (diphenhydramine) while waiting. Try antifungal spray? But don't worry too much while waiting.