I have these red spots all up and down my legs and thighs what could they be?

Anything. We might be able to narrow it down for you a bit if you gave us more information, such as how long it has been there, whether it itches or hurts, and if anyone else in your household has anything similar, or is itching. But as a rule, rashes are very difficult to diagnose without actually seeing them; you'll probably have to see a dermatologist to find out for sure what is going on.
Lots of things. That type of rash needs to be seen by a physician. Lots of things cause rashes, most of which are benign, and some of which are serious. The appearance of the rash is important in determining the cause, so direct visualization by a doctor is necessary.

Related Questions

I have bright red spots on both legs from thigh down and is very itchy?

Many possibilities. There are many types and causes of skin rashes. Several types of inflammatory conditions of the skin, allergic reactions, and sometimes bacterial, viral or fungal infections can cause rashes on the skin. Insect bites can also be the cause of a rash on the skin. Have it evaluated by a professional and get the appropriate treatment.

My boyfriend has itchy red spots along leg&inner thigh. My ankle have been&theres1spot on bra line. Switched sheets&detergent last week. Opinion&thghts?

Rash. If the rash developed after you switched detergents it could be allergy. If it was prior then will need a picture to start to evaluate.
They gotta sleep. Without actually seeing these itchy red "spots", one cannot be certain. And understand that I am speculating. But you can look on the internet for pictures. Are you ready??? BEDBUG bites. Calm down. It's only an educated guess.

What to do if I am having small red spots in my hands, thighs, legs and chest I don't know what it is and also?

Get blood work. You could have a platelet blood disorder. Possibly due to a blood infection or a medication you are taking or a genetic predisposition. Get checked out by your doctor this coming week!

I have itchy red spots at the top of my thigh that have turned into bruising looks like I have been beaten up on my leg.?

Itch & bruising. If you have unexplained bruising, please see your doctor. Several possibilities for itching and bruising of isolated spots on body. Scratching an itchy spot can produce bruises, particularly if you occasionally take nsaids, fish oil, vitamin e and other blood thinners. There is also a skin condition called pigmented purpura, inflammation of the smallest blood vessels, which can be itchy.