Hi
Welcome to Healthcare Magic Forum 
Seems like you have developed 
Pityriasis Rosea(PR)
PR manifests as an acute, self-limiting, papulosquamous eruption with a duration of 6-8 weeks.
PR has been linked to upper tract respiratory infections.
The disease typically begins with a solitary patch, usually salmon-colored, that heralds the eruption and thus is commonly referred to as the herald patch or spot. This initial lesion enlarges over a few days to become a patch with a collarette of fine scale just inside the well-demarcated border.
Within the next 1-2 weeks, a 
generalized exanthem usually appears, although it may occur from hours to months after the herald patch. This secondary phase consists of bilateral and symmetric lesions with scales .This phase tends to resolve over the next 6 weeks, but variability is common.
Pruritus is commonly evident in 25-75% of patients and usually of mild-to-moderate severity.
The eruption is symmetric and most commonly involves the thorax, back, abdomen, and adjoining areas of the neck and extremities.
As is a self-limited disease; treatment is supportive. Topical 
zinc oxide and 
calamine lotion are useful for pruritus. If the disease is severe or widespread, topical or oral 
steroids may be used.
The 
skin rash may take 6-8 weeks to clear up completely..You can take oral antihistamines like levocetrizine for pruritus.
Hope it helps
Dr Geetika Paul