Itchy sores all over my body

hi everyone, for last few months ive been in what feels like torture because of these sores that are all over my body. They make me so so itchy to the point that makes me cry and I can hardly bare it. Photos don't do justice of how bad they are, but I was just wondering has anyone experienced this before? it started off as just being itchy but now these sores keep popping up all over my body and the amount keeps increasing. they are especially itchy when I get warm (like having a warm shower or when i have a jumper on for too long). I've been to the doctor and he is unsure what is it but have given me creams to try and he also suggested changing the pill I'm on, but I'm not sure that it's that. My brother has severe psoriasis and my mum thinks this could be the beginning of me developing that. These pics are just 3 that are on my body but I'm covered in them and so is my scalp. Any help would be much appreciated as I don't want to live my life itchy anymore :(((