For lightening blemishes
Grated peel of an orange or lemon
5 tbsp milk.(if orange is small-3-4 tbsp milk will do)
Mix the grated peel with milk and apply on your face.
Leave this for 15-20 mins and rinse with lukewarm water.
Next mask to lighten blemishes
1 spring mint leaves
2-3 tbsp rosewater
Grind the mint leaves or cut them into small pieces(very small) and mix with rosewater. Apply this paste on your face. Leave it for one or 2 hours and rinse with cold or lukewarm water. This one is very good but I only used it once as 1 hour is too long.