Suggest Treatment For Skin Rash Due To Allergic Reaction

Hello. On Tuesday March 18th, I woke up with small little red dots and bumps from the bottom of my face down to my waist. I figured they were from an allergic reaction that occurred from my boyfriend s laundry detergent or blanket that perhaps arose also because of stress from finals week. However, it is now Sunday and the rash has mostly disappeared, but it is still kind of there. Except now, I have developed an itchy similar rash on my hands (front, back, and inbetween my fingers). I have also developed a large red eczema like rash on my elbows (which has happened before, but not as badly, and it came along with my other rash). I don t understand why this rash keeps changing locations and how it would trigger an eczema like rash on my elbow, but different elsewhere. Thank you.