I bought the Herpotherm a few months ago and since then all the time. In your handbag with me just in case Since about 1 year I get namely punctual and regular at the beginning of the monthly menstrual a cold sore on always the same place at the outer edge of the upper lip. I also had before it from time to time an outbreak, but maybe once a year. Then suddenly this rhythm (as is you go right on ahead burdened with the monthly pain). At first I thought was a coincidence, but then it occurred always on the first day usually with a slight itching and a strong swelling until the outbreak with all the trimmings. So I bought the Herpotherm despite all doubts. I then turn it on the first day of my rule every few hours and several times close to each other, so I am sure also that I caught the whole area. Because the herpes always occurs at the same point, I can begin treatment even before the first signs can be seen. There nevertheless still is a slight swelling of the body but that's nothing compared to previously. It also falls really only myself to because I naturally always hinsehe exactly. The whole thing I do then for 2-3 days, then the swelling is gone and no more itching and I have one months my peace! Hooray !! It is a very great invention and I am eternally grateful for the device. It is in the acquisition not cheap, but the creams etc. anyway not help cost a lot and stay pain. The batteries I find quite expensive, but I do not regret the purchase. I recommend it any herpes infested. No idea if it works every time, but an attempt is worth it! Many thanks to the developers of this product. I still have the hope that it will eventually be all over with this evil, but it is in this way so no longer bad and also the brief pain from the heat is quite bearable and you get used to it. Oh, once I had the part not there and the bubble grew. I then once it was possible to apply the Herpotherm and healing took place much faster. Although it hurt a little more on the open wound, but I endure like, although I may quickly get rid of the bubbles. So, just try it !!