** Drug developer Krystal Biotech's KRYS.O shares rise 9.75% to $171.96

** Co posts Q4 rev of $91.1 mln, beating analyst est of $90.5 mln, as per data compiled by LSEG

** Co's net income for the quarter was $45.5 million or $1.58 per share, compared with net income of $8.7 million or 31 cents per share a year ago

** Stock has risen 40.3% in the past 12 months

(Reporting by Padmanabhan Ananthan)

((Padmanabhan.Ananthan@thomsonreuters.com;))