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I hope you have been prescribed rifampicin and linezolid after pus culture and sensitivity of lesions. Rifampicin is considered to be most effective in treating follicultis caused by staph aureus. As resistance to rifampicin may develop rapidly(weeks atleast), so it should not be used as monotherapy. Now as you took rifampicin yesterday, you can definitely start linezolid from today. Just one day of rifampicin monotherapy would not cause resistance. I prescribe rifampicin for 6 to 10 weeks along with another antibiotic for remission. As long as patient is on therapy, repeated pus culture and sensitivity should be done to assess response and rule out resistance. Also liver function test should be done regularly as rifampicin can cause liver related side effects.
Along with rifampicin use antibacterial scalp wash like cetrilac or betadine AD. Also apply topical cream like mupirocin twice in a day over scalp and in nasal vestibule. Nasal cavity can be a focus of bacterial infection in recurrent follicultis.
Hope this helped. Should there be any doubt,please write back