my god, there is sth wrong in my camera! help.

不知道是不是昨天在沙滩上 沙子吹进镜头里。现在照出的相片都有一个污点。怎么办。。？？？

 

i dont know if i stayed at the beach and the sand blow in my camera lens...

and now the pic i took that has an ugly blot...>< sb, help me !

Done