Shaving is really fucking irritating my skin (I have pretty bad acne on my chin.. it seems to be getting better but every time I shave it just goes fuckoff bad). I only shave every week or so preferably.. whats something that'll keep it that length all the time [lengthwise maybe 3mm? Just before it starts getting itchy], with the least irritation possible? Or is any trimmer going to irritate my skin even more (no idea how they work)?