Hcv Ab Elisa not detected means one is negative for Hepatitis C.
The hepatitis C transmission is unlikely by your description because;
1) The dried blood on bed sheet will have far lesser time for Hepatitis C virus to survive.
2) Secondly scraping the pimple is quite unlikely to transmit the virus. This is unlikely way of transmission of Hepatitis C.
3) Lastly there is an assumption that blood on bed sheet had hepatitis C virus. This may not have any kind of virus on this blood stain on the bed sheet. So a wrong assumption is unnecessary causing anxiety.
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