Differin is indeed an effective topical treatment for acne that is commonly prescribed.
As you have rightly stated, it can cause an initial worsening of acne (usually during the first 4 weeks of initiation) BUT having said that, this is also uncommon.
Other possible side effects include skin dryness, redness, irritation etc.
These side effects do sound daunting but it should not put you off from starting this treatment as these can definitely be managed by your doctor.
What I would suggest is applying Differin once every 3 days first then slowly increase the frequency to once daily.
In this way, you will be able to monitor your response to Differin and your doctor will be able to adjust the dosing accordingly.
Millions of patients are on Differin and with careful follow up, side effects can be kept to a minimal.
Note: Differin may also make your skin more sensitive to UV rays so application of a sunscreen of SPF 30 and above is advised.
Hope that helps.
All the best!