Eczema Treatment Care

So I was diagnosed with scabies yesterday and a couple weeks before this I was diagnosed with dermatitis and I don’t know which is correct? I got the cream and put it on last night and washed my clothes and bedding but I don’t think I have scabies because I haven’t been in close contact with anyone except my bf and he doesn’t have scabies. I read that it can only be contagious through prolonged skin to skin contact and I want to know if that’s true. I am scratching a lot but it’s not keeping me up at night. The doctor who diagnosed me with it did no testing and just said that’s what I had in like one second of looking at it and not even looking at it closely so I am having doubts that I have it. I am currently living with my parents and now they are worried about getting it but I think they would’ve had it by now and I just don’t know how I got it in the first place?? If you can help me that would be great! Thanks!

my 4 month old has a bunch of dry skin patches all over, he has two patches on his arm that are like dry and scaly & gross. My pediatrician told me it was soborreic dermatitis. My cousin just told me she came in contact with scabies and that i should take aiden back to the doctor to find out if thats what it is.
my ped told me to use hydrocorizone cream1% everyday once a day to treat the seborric dermatitis, when i forget a dose the rash comes back. If i were to use hydrocorizone cream on scabies would it go away and come back like this? or am i freaking myself out?

I woke up Friday morning with a few blisters on each wrist. Throughout Friday the rash spread to my leg then abdomen. By Saturday it had gotten worse so my family made me go to the ER. The ER doctors said it was maybe contact dermatitis or a virus. They gave me a shot, prednisone and stuff to help the itching. It hadn’t gotten better by Monday but in fact had spread to my toes so I went to my doctor’s office. My doctor couldn’t see me so a nurse saw me, freaked out and sent me to a dermatologist. The dermatologist said she thought it was a drug allergy. I take a few medications for my headaches and back problems. She kept saying, “it’s so diffuse that it has to be a drug allergy”. It hasn’t gotten better and I was googling, accidentally came across scabies and it looks like my rash. Now I am freaking out!!!!! I don’t want to give this to my baby. Could my doctor miss scabies? I have dogs. I have read that dogs can pass it to humans and have also read that they cannot. We have had all of these squirrels dying in our neighborhood, is there a link? I can’t possibly think of where else I could have gotten scabies. I also really want to know; does scabies spread that fast over your body?