Brief Answer:
Firstly it has to be confirmed if its acne

Detailed Answer:
Hi,
Thanks for writing to us.
Firstly it has to be seen whether the lesions you are having is acne or not. Acne beyond the age of sixty is not commonly seen.
Other possibilities could be rosacea, seborrheic dermatitis or acne agminata.
If it is acne doxycycline and accutane should help. Even if its rosacea these too should help. Seborrheic dermatitis and acne agminata too should respond to accutane.
Please consult a qualified dermatologist to get these differentials ruled out.
If at all its acne, use of doxycycline orally along with application of benzoyl peroxide gel and adapalene gel should help.

doxycycline or the medicated wipes won't harm you. I would appreciate if you could attach an image of your concerned lesions as it would help me in thinking about a possible diagnosis and helping you further.

Hope this helped.
Take care

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