I have been in Thailand for the past few months. About a month ago, I noticed a reddish/pinkish area on the top/back of my left shoulder. The patches feel slightly raised. There is also a reddish patch on my neck, although it looks different from the one on my shoulder. The patch on my neck looks like razor burn, but it did not appear immediately following a shave, and it has been around for nearly a month. Neither of the rashes is itchy at all, and neither has grown or shrunk significantly since I've noticed them.
Any ideas? I've attached a photo. Any help is appreciated.
Thank you.