Welcome to HCM.
Street dogs are very risky for rabies
and one must take utmost care regarding rabies,
it may not be open wound but the area should be cleaned with alcohol and Povidone iodine
that is Betadine
should be applied and not chilly powder as you have done please visit a doctor or hospital and please understand that, rabies has no cure,
please go for vaccination
for any suspicious exposure.
Usually it is bite and exposure to saliva which transmits virus.
albeit chances of rabies very negligible, through scratch wounds.
However in your case, I would suggest you to take post exposure vaccination at the earliest - active vaccination with HDCV on day 0.3,7,14 and 28.
You can watch the dog if possible than last two dose can be omitted if dog is allright.
Please take care