This looks most like eczema. Contact dermatitis looks similar.
Did it start within a few days of a new product, or of touching something new?
Why? This reaction usually occurs within a few hours or days of exposure to an irritant or allergen. NHS
What helps
Apply moisturizing treatments (emollients) to your skin as often as possible, at least 2 times a day, and continue to moisturize even if your eczema improves.
NHS
TodaySkinCareAsk
What the sources say about eczema
Eczema is a term for several different types of skin swelling.
Atopic eczema can make your skin: itchy; dry, cracked, crusty, scaly or thickened; red, white, purple or gray, or lighter or darker than the skin around it (depending on your skin tone); blister or bleed.
Illustration made for this page. The sample answer shows how Skinby words a result: a visual resemblance, not a diagnosis. Skinby never names serious conditions from a photo. Statements from the NHS website contain public sector information licensed under the Open Government Licence v3.0.