Allergic rash

I applied the product on a couple of midweek evenings and then by the weekend and red rash appeared on the inside of my arms, around my bosom and my neck. I have never had any allergies or skin problems, so I was surprised. I had to seek advice from an NHS doctor and pharmacist and had to take anti-histamines and hydrocortisone cream. I have no idea which of the ingredients would cause this reaction.
My legs have not reacted and I do like the colour of my legs with this product, but I am very nervous about it because of the damage it has done elsewhere.