I found red spots all over my legs and it spread...

What is the treatment of skin rash ?
There are many causes for skin rash which may cause other symptoms such as itching and discomfort and you have to do clinical assessment in the nearest medical center and to avoid scratching the skin as much as you can and to Wear comfortable and clothes that are made of cotton . Avoid wearing tight clothes. Your doctor will prescribe medications such as Loratidine and prednitab to ease the symptoms and you can use creams such as Triderm twice daily for localized areas .
What are the causes of skin rash ?

• Bacterial infection .
•  Viral infection
• Skin allergy
• Fungal infection
• Sexually transmitted diseases
• insect bites 
• other causes 

What Should you do at the moment ?
You should follow the tips and advice provided to relieve itching of the skin . If there is no improvement or the symptoms worsen  you should consult your dermatologist for assessment  and re-evaluation .