Red patch on breast

I’ve been having this occasional throbbing ache in a spot on my breast. When I changed my shirt last night I noticed there’s a red patch where the pain occurs. It’s not hot to the touch and it doesn’t hurt when I touch it, nor do I feel a lump. I’m 5 weeks postpartum and I do not breastfeed but my breasts are still occasionally leaking. Nothing else hurts besides that occasional ache - happens like for maybe 30 seconds and then disappears for hours. Has anyone else experienced this?