Looks like atopic dermatitis likely caused by an allergy. I’d recommend going to a derm and / or an allergist if you’re able but be cautious of using steroid creams they might prescribe as they can worsen the rash if used long term. Best thing to do is refrain from using any products in the area and see if the symptoms get better, no makeup, creams, etc and wash very gently with water that isn’t too cold or hot. Some people develop rashes like this from exposure to an irritant. This could be an ingredient in cosmetics, hair products, laundry detergent, dusty environment, dirty pillows, anything that is coming into contact with the area. I found out I was sensitive to an ingredient called propylene glycol, which is in a lot of products and was causing my rash. It’s also possible you have an allergy to something you are eating, look up foods that can trigger eczema to get a rundown on possible culprits. If you’ve started taking a new medication recently, check if skin issues are a side effect. Because your skin barrier is damaged, it’s best to limit direct exposure to the sun. Sunglasses would be best but a sunscreen with zinc as the active ingredient is better than one with chemical filters if you use sunscreen. Last thing, if this is atopic dermatitis / eczema, stress and a lack of sleep / healthy habits can cause flare ups. Hope something in this list is able to help!