White blotches while taking photograhs

well i am using a canon powershot a1100 is for about 4 mnths.... works fine for me considering casual photoshooting....!!!!:) bt recently i noticed that when i use the flash,certain white blotches appear in the images.....:S how 2 get rid of this??? nd do i need any lens cleaning liquid for this?????:huh: pllzzzz suggest............
 
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