4th treatment yesterday

Hi, I just had my fourth treatment yesterday with the Gentlelase on my chin and neck. The results so far have been outstanding. However, today I am still a little swollen and also somewhat red. With my previous treatments my swelling would go down in a matter of hours and there was no redness. I do know that the laser tech who treated me had to use a higher frequency b/c my hair is finer now, so is this what may have caused it. When should I expect the swelling and redness to subside? Thanks