Possibly herpes

So my friend has thought she's had herpes for a long time now and is too scared to get tested. She just told me that her son had a sore on his butt and she hope's that's not what it was. I babysit this little boy sometimes. Is there a chance my kids could catch it from him if he has it? How would he even get it? She said one day he put a tampon applicator in his mouth because she forgot to shut the bathroom door. I guess I don't fully understand how a 19 month old could get herpes if that's even what it is. I'm not trying to sound ignorant. She also said she had scabies and then he had little bumps on his hands and back. I know this sounds awful I'm just concerned for this little boy.