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You can use the tree icon to upload photographs however from your description of multiple sites then it is highly unlikely that this is cellulitis.
Cellulitis is a bacterial infection that causes an area of skin to become red, hot, tender and occasionally swollen. It tends to occur around areas of damaged skin so having one area around the sores would be more likely to be cellulitis.
Areas of red, itchy skin across different areas of the body may be an allergic reaction, eczema or a different type of skin condition which may include fungal or viral infection.
If it is itchy then an oral antihistamine plus perfume-free moisturizer or anti-itch cream would be the first action.
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Thanks for the photograph, it does look cellulitic in nature from this view. I would suggest that you draw a line around the outer margins of the red area, this will show you if it is spreading. You will need to see a doctor today for a closer inspection and more definitive diagnosis. If it is cellulitis then you need to start treatment as soon as possible.
It would not be contagious if under your clothing, but usually cellulitis is so painful that people cannot function at work so time off work is usual. Your doctor will be able to give you a more accurate recommendation once he/she inspects the leg.