IBC Symptoms and second Opinion

Hello all, I am a 44 year old mother of 4. I never breastfed. Last Saturday I noticed what looked like a few bug bites on both the inner part of my right breast and the outer part of my right breast near the armpit. I also have some nipple discoloration, a heavy feeling in that breast, some itching and pain. I went to the dermatologist on July 6 to get a full body skin check because I am also being checked for a recurring melanoma. She gave me a steroid cream but the rash hasn't gone away. I am also seeing a gynecologist who did blood work for pelvic pain and my Cancer Antigen 125 is also high. I went to my PCP this morning and she gave me an antihistamine and Tylenol. When she checked my lymphnodes they were enlarged by my clavicle. I also had my 6 month Mammo and U/S today. The radiologist says she didn't see anything worrisome and I have some cysts. When I mentioned the rash and other symptoms she just blew me off and said to keep seeing the derm doc and the PCP. I feel like I need a second opinion but being active duty Army it may be difficult to see a civilian doctor. Has anyone else had these symptoms and do you think I should definitely get a second opinion. Thank you for listening, I am a nervous wreck!