Don't worry about it at all. At our store they have a phone as you walk in and it says on it 'been off sick? Dial ... And let us know how you're doing', if your store is like that then dial the number and they'll sort it, if not just let someone from personal know you're back. Your manager will most likely have to conduct a 'back to work interview' it's not what it sounds like though, you basically have a form filled in and you explain to them why you was off, they fill it out, put it in your file and that's basically everything. It sounds all formal but no one really bothers much about them!
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