I live in a small 1-room apartment in South Korea. About 1-2 weeks ago I started noticing bites on my upper arms/shoulders. At first I thought they were pimples, but I started googling and now I'm very worried that it's bedbugs.
Since the first time I noticed the bites, I've found about 6-10 more over the past week or so. They are mostly on my lower legs and upper arms and tend to be in clusters. They do itch, but then again I've become very hypersensitive to itching sensations since I started suspecting bedbugs.
I've found a couple possible blood/fecal stains on my pillows but none on my sheets or mattress. I've checked the piping of the mattress and found nothing. I've seen no visible signs of actual bedbugs anywhere in my small room, although granted I haven't checked every crack and crevice in my room because I've been too scared. :cry:
At the link are pictures of the bites on my leg and arm, the stains on my pillowcase, and the one small thing (bug? fecal matter? what is it???) that I did find under the piping of my mattress. It's next to a Korean coin which is about the size of a US nickel.
https://drive.google.com/folderview?id=0B1wnTjhqdNlbaGVCZzZsWDRlcjQ&usp=sharing
Can someone please, please help me identify these? Is it bedbugs? If so, what do I do? I read some of the other posts on here about bedbugs in Korea and have the same fear that they did: not being able to communicate with my landlord/the PCO about WHAT they are going to do/use in my room to get rid of these things. I certainly don't want to make the situation worse by them using the wrong treatment, especially if I currently have a mild infestation.
This is causing me a lot of stress and anxiety. 
Please help! Thank you!!