Thank you for getting in touch, so sorry to hear that your scalp has been burnt and has blistered. If you had visited the salon for a colour service and immediately after this service you recognised these symptoms then this may be the cause. Did you experience any burning sensation when the hair colour was on your scalp? It is a requirement that salons do a 24 hour patch test for new clients to prevent any allergic reactions such as burning and blistering, amongst others. Without seeing your scalp at the time I can not say for certain the cause, I do hope that your scalp has recovered and would advise you to make sure you always notify future stylists of this experience before any colour service.