PubMed is a very unique database, in that it does something called Automatic Term Mapping (ATM). Pubmed will automatically translate keyword searches to find additional research, including mapping keywords to subject headings.
Try It OutLet's search for ringworm in PubMed!!
Click here to visit PubMed
Remember to use the PubMed link on the library databases page -- this will give you additional full-text options!!
Note that PubMed identifies subject headings in your search using a code after the heading. So for ringworm, your subject heading could look like this:
Or for a major subject heading:
When using MeSH terms, Pubmed automatically "explodes" the subject heading -- this means that Pubmed will search for your subject heading, but it will also search for any subject headings underneath that term in the MeSH tree. This will expand your search results. For example, if you were searching for Tinea, you'll also see information about Onychomycosis, Tinea Capitis, etc.
If you want to turn off Pubmed's automatic explode option, you can add the following to your search [mh:noexp]