You have noted that the <span style = 'background-color: #dae8f4'>rash</span>
usually recurs at a certain time of the year and also on
the exact same location
. This may be a case of fungal infection
or tinea versicolor. Tinea versicolor may appear as a whitish patch which may not be noticeable in fair skinned individuals. Given the right con
s like humidity , sweating, and weather changes the rash
may be reddish with a well defined ring. They may also itch
I suggest that you have this assessed by a pediatric dermatologist.