Acne? Allergic reaction? Hormonal Imbalance?

Ive gone back to using ProActiv and the first night I used it, my skin felt a little irriatated after the toner application. The next day my face was itchy and felt like it was getting tighter. I noticed little bumps that turned into little white pimples. its all over my chin and some appear on my cheeks. To make things worse, I naired my upper lip (haha) and i thnk it irritated my skin a little more. I ended up getting my period the day after I nair'd and i've heard that your face can get irritated off certain facial products if used when you're on your period. One more last thing.. I recently changed my skin foundations. I've been using this tinted moisturizer and mineralized press powder.. I doubt that has affect on my skin now but it could be a possible reason. Can someone please help me and tell me if this is an allergic reaction? My skin is not sensitive nor heavily oily, just inbetween. I get a few blemishes around the time of my period but nothing major. What do you think could be the reason for this reaction to my skin?

[loiloi]

It is possible to develop an allergic reaction (allergic contact dermatitis) to a product even if you have used it before. Take an anti-histamine such as Piriton to reduce the redness and itching. Use a bland cleanser such as La Roche-Posay or Cetaphil until your skin is no longer sensitized.
If you are prone to acne and facial hair you will benefit from taking a combined oral contraceptive pill such as Diane35/Dianette or Yasmin. These block the action of androgens (male hormones) in your body.
Eloise.