Could seborrheic dermatitis cause red patches on the skin?

Hello doctor, I have had a persistent red patch on my left cheek for around six months. It comes and goes. It is mildly raised, gets flaky sometimes, and does not go away with moisturizers. Along with this, I also have flakiness and mild redness on my eyebrows, around the nose, on my scalp (dandruff-like flakes, long term), behind the ears, on the forehead near the hairline, and in the beard and cheek area. The affected areas are not usually itchy, but occasionally feel irritated or warm. Based on my research, I think it could be seborrheic dermatitis, but I want a professional diagnosis and guidance. I have not used any steroid creams or strong treatments. For the face, I did try moisturizers, but the patch did not go away. I would appreciate your help in confirming the diagnosis and recommending a safe and effective treatment plan. Please help. Thank you.